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audio: add enable count for PDM module [1/1]

Browse Source 
PD#IPTV-3723

Problem:
One use case is PDM module is sendig data
to both PDM device and LOOPBACK device.
Close one will make another useless.

Solution:
Add management of the PDM module by
a enable count.

Verify:
SM1.

Change-Id: Iceeb756c02671b16dbc3c49a9b793a50e6e559b5
Signed-off-by: Shuai Li <shuai.li@amlogic.com>
This commit is contained in:
Shuai Li
2019-08-08 16:17:32 +08:00
committed by Luan Yuan
parent 412aeb27ec
commit 230e822ef5
1 changed files with 23 additions and 12 deletions
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35
sound/soc/amlogic/auge/pdm_hw.c
View File

@@ -19,28 +19,39 @@
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/string.h>
/*#include <linux/delay.h>*/
#include <linux/spinlock.h>
#include "pdm_hw.h"
#include "regs.h"
#include "iomap.h"
#include "pdm_hw_coeff.c"
static DEFINE_SPINLOCK(pdm_lock);
static unsigned long pdm_enable_cnt;
void pdm_enable(int is_enable)
{
if (is_enable) {
aml_pdm_update_bits(
PDM_CTRL,
0x1 << 31,
is_enable << 31);
} else {
aml_pdm_update_bits(
PDM_CTRL,
0x1 << 31 | 0x1 << 16,
0 << 31 | 0 << 16);
unsigned long flags;
/*udelay(1000);*/
spin_lock_irqsave(&pdm_lock, flags);
if (is_enable) {
if (pdm_enable_cnt == 0)
aml_pdm_update_bits(
PDM_CTRL,
0x1 << 31,
is_enable << 31);
pdm_enable_cnt++;
} else {
if (WARN_ON(pdm_enable_cnt == 0))
goto exit;
if (--pdm_enable_cnt == 0)
aml_pdm_update_bits(
PDM_CTRL,
0x1 << 31 | 0x1 << 16,
0 << 31 | 0 << 16);
}
exit:
spin_unlock_irqrestore(&pdm_lock, flags);
}
void pdm_fifo_reset(void)